Good, Bad and Ugly: The Decade in Reality TV

"My last book, How to be Famous, didn't make the New York Times best-seller list because it was in the self-help section," Pratt told Us. "This one is going to be totally different, I'm not holding anything back."

“Speidi,” as the pair used to refer to themselves, wed in November 2008.

In June, Montag filed for legal separation, though fellow “Hills” cast members cautioned the split was likely a publicity stunt.

Montag filed for divorce last month. The divorce will likely become official by Valentines Day 2011, MTV reported.